Alexander mcdonald



(No Model.)

A. MoDONALD.

ROTARY DISC CUTTER HOLDER.

Patented Aug. 8, 1882.

Fliy. If

nzns. Phmwm m. Wndnnglon. a. c.

UNITED STATES PATENT OFFICE.

ALEXANDER MCDONALD, OF CAMBRIDGE, MASS, ASSIGNOE TO THE MCDON- ALD STONECUTTING MACHINE COMPANY, OF NASHUA, N. H.

ROTARY DISK-CUTTER HOLDER.

SPECIFICATION forming part of Letters Patent No. 262,237, dated August8, 1882.

Application filed May 29, 1882' (No model.) 1

To all whom it may concern Be it known thatI, ALEXANDER MCDONALD, ofCambridge, of the county of Middlesex, ot' the State of Massachusetts,have invented a 5 new and useful Improvement in Rotary Disk- CutterHolders for Machines for Cutting or Dressing'Stone; and I do herebydeclare the same to be described in the following specification, andrepresented in the accompanying l drawings, of which- Figure 1 is a topview, Fig. 2 a side elevation, Fig. 3 a front end elevation, Fig. 4 avertical and longitudinal section, and Fig. 5 a horizontal section, ofmy new improved mechanism for 15. supporting and adjusting thedisk-cutter of a stone-cutting machine.

My present invention relates to another cutting-machine of the classshown and'described in Letters Patent No. 222,194, granted to meDecember 2, 1879, and it is to take the place ofthecuttercarryingandadjustingmechanism, as described in such patent, the nature of my saidpresent invention being duly set forth in the claim as hereinafterpresented.

In the drawings, A denotes one of the arms of the cutter-carrier, and Bthe disk-cutter, applied to each arm by mechanism to admit of the properadjustment of the cutter. The arm has a lip, a, projecting from itat itsouter end and 0 at one side of it. Two screws, b b, are screwed into andthrough the lip and against the recessed blockC, pivoted to the arm soas to be capable of turning laterally, the pivot d of such block beingprovided with a screw, 6, that screws through a nut,f, arranged, asshown, within a narrow space or opening, g, in the arm. By turning thenut on the screw the block C may be moved a little either toward or awayfrom the shaft-receiving hole h of the 0 arm. The block C is recessed inits front to receive a slide, 2', which, at its opposite edges, isoverlapped by two clampplates, 70, arranged as shown, each of suchplates having two screws, 1 I, going through it and screwed into theblock C. A screw, m, arranged in the up- 4 5 per part of the block,serves to depress the slide in its recess. From the slide '5 two lips,

n 02, extend, as shown, there being arranged between and pivoted to thema cutter-support piece, 0, provided with a disk-cutter, B, whose spindleq is adapted to such support-piece so as to be capable of freelyrevolving therein,

it being held in place by a washer, 1', and nut s, arranged on a rod, t,extending from the cutter through the spindle, and having a screw toreceive the nut. The washer bears against the upper end. of the spindle.

There is a screw, to, in the rear part of the support-piece 0. The headof the said screw rests against the slide. By means of such screw theinclination one way of the cutter-support piece may be adjusted, itbeing afterward clamped in position by another screw, c, which screwsthrough one of the lips of the slide. One of the pivots of thesupport-piece is shown at w.

By the above-described mechanism applied to the arm of thecutter-carrier the disk-cutter can be adjusted or varied in itspositions as occasion may require, to cause it to operate to 0 the bestadvantage.

I do not herein claim disks for cutting or dressing stone; but

What I claim as my invention is as follows:

The combination of the cutter-spindle support-piece 0, the lipped slidet, the pivoted and recessed block 0, and the lipped arm A, ar-

ranged and adapted and provided with clamps k, and adjusting-screws,substantially and to operate as set forth.

ALEXANDER MCDONALD. Witnesses:

R. N. EDDY, E. B. PRATT.

